diff --git a/.gitmodules b/.gitmodules
index 00d9187a13a..cb1a007c66f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,18 +1,9 @@
-[submodule "installer"]
-	path = installer
-	url = https://github.com/geonetwork/core-installer.git
 [submodule "gast"]
 	path = gast
 	url = https://github.com/geonetwork/core-gast.git
 [submodule "maven_repo"]
 	path = maven_repo
 	url = https://github.com/geonetwork/core-maven-repo.git
-[submodule "release"]
-	path = release
-	url = https://github.com/geonetwork/core-release.git
-[submodule "docs"]
-	path = docs
-	url = https://github.com/geonetwork/core-doc-sources.git
 [submodule "web-itest/webspecs"]
 	path = web-itest/webspecs
 	url = https://github.com/camptocamp/webspecs.git
diff --git a/docs b/docs
deleted file mode 160000
index e3cdcdcf6d2..00000000000
--- a/docs
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit e3cdcdcf6d2c488c91335dfad428cae5721994fa
diff --git a/installer b/installer
deleted file mode 160000
index d7000ab239c..00000000000
--- a/installer
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit d7000ab239cb61097af7f922f5466a5f55734433
diff --git a/release b/release
deleted file mode 160000
index 32dab673db9..00000000000
--- a/release
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 32dab673db9248bd8d481992c3cd36e3e2a6173f